Ulamog, the Defiler 15 (Modern Horizons 3)

When you cast this spell, target opponent exiles the top half of their library, rounded up. Ward—Sacrifice two permanents. Ulamog enters with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile. Ulamog has annihilator X, where X is the number of +1/+1 counters on it.

NM - $28.20
LP - $22.60
MP - $17.00
HP - $11.30
DMG - $5.70